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  • Based on 2025 BC commercial driver's licence manual
  • Updated for April 2025

To drive commercial vehicles with air brakes on British Columbia’s public roads, you must obtain an air brake endorsement on your commercial driver’s licence (Class 1, 2, or 3). To do this, you must meet a series of requirements that depend on whether you hold a Class 1 licence.

If you don’t already hold a commercial licence, you must meet an even longer series of requirements to obtain one, which depend on which class of licence you plan to obtain. One of the most crucial requirements is to pass a knowledge test on the basics of commercial driving. You must pass this test to get a commercial learner’s licence, which will allow you to practice commercial driving under supervision. If you are seeking a Class 1 licence, your knowledge test will include questions on air brakes. And for Class 1, you must also enroll in a Class 1 Mandatory Entry-Level Training (MELT) course (which includes air brake training) once you have obtained a commercial learner’s licence. Regardless of the class of licence you’re seeking, after at least two weeks have elapsed and you’ve practiced enough to drive safely, you can book a road test for your full-privilege commercial licence.

How to obtain an air brake endorsement on your commercial licence depends on the licence class. For Class 2 or 3, you must first complete an approved air brake course or prove you already have equivalent experience with air brakes. Then pass an air brake knowledge test and an air brake pre-trip inspection test of a single-unit vehicle with air brakes. For Class 1, you must satisfactorily complete the MELT course before the road test. Your Class 1 road test will include a pre-trip inspection test of a combination vehicle with air brakes.

If you’re looking for intensive practice to reinforce your knowledge of air brakes, you’ve definitely come to the right place! We have fifteen British Columbia Air Brake practice tests, of which this test is just the first. We’ve designed all of them to help you ace all the official air brake knowledge test questions you may encounter, whether on the Air Brake knowledge test or the Class 1 knowledge test.

If you have trouble with any practice question, you can ask our AI Assistant to rephrase the question, give you a hint, or answer any question you might have on commercial driving. If you still answer incorrectly, the AI Assistant will tell you the correct answer and explain why it is correct.

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  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
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What you need to know
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
Ensuring the accuracy and quality of our program is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article.
What to expect on the official exam
40

questions

32

correct answers to pass

80

passing score

List of questions (classic view)
  1. Should you pump (keep pressing and releasing) air brakes?
  2. It is important to keep compressed air as dry as possible because
  3. What does the low air pressure warning device warn you about?
  4. If the low air pressure warning signal comes on, what should you do?
  5. The effectiveness of the spring brakes for emergencies or parking
  6. During normal driving, what keeps the spring brakes released?
  7. Assuming good traction and constant vehicle weight, if you double your speed, your vehicle's braking distance will be
  8. If drum brakes overheat, the vehicle's stopping distance will increase. What is the reason for this?
  9. Air braking systems tend to react slower than hydraulic braking systems because
  10. While travelling downhill, you notice that each time you want to brake, you must press the brake pedal farther down than the last time to achieve the same braking force. What could be causing this?
  11. The maximum air pressure available for braking is determined by
  12. The foot (treadle) valve
  13. Which of the following can impair braking effectiveness?
  14. After you apply the service brakes, what happens to that compressed air?
  15. What does an alcohol evaporator do?
  16. When you test the system air-loss rate, the maximum acceptable air-loss rate per minute after the initial drop is ________ except for vehicles with two trailers.
  17. You're driving a vehicle equipped with a dual air brake system. The low air pressure warning signal comes on, but one system still has normal pressure. What should you do?
  18. How should you test your vehicle's low air pressure warning signal?
  19. An application pressure gauge shows the air pressure
  20. All vehicles equipped with air brakes must have
  21. What is the colour coding that is often used for the supply and service lines to the trailer?
  22. The hand valve of a tractor-trailer
  23. In a vehicle equipped with air brakes, what does the governor control?
  24. Polarized gladhands on a tractor
  25. ln vehicles with three dash-mounted push-pull valve knobs, how are the valve knobs usually coloured?
  26. What is the purpose of a quick release valve?
  27. What is an advantage of automatic slack adjusters?
  28. You must make heavy brake applications as part of your pre-trip inspection. Why should you release the spring brakes first?
  29. In a tractor-trailer, blended air is air from
  30. How is the heat produced by your vehicle's brakes dissipated?
  31. What is brake lag?
  32. Drivers must hold an industrial air brake endorsement if they will be __________ on industrial roads.
  33. As part of your pre-trip inspection of a combination vehicle with air brakes and one trailer, you should make sure that the air-loss rate per minute is not greater than
  34. After you've connected your tractor to a trailer, you should test the trailer service brakes by applying
  35. How can you tell how much air pressure is in the service reservoirs?
  36. How can you tell if you have cross-connected the supply line and the service (control) line on a tractor-trailer with air brakes?
  37. When adjusting a manual slack adjuster, how can you tell whether you are turning the adjusting bolt in the correct direction?
  38. When using the applied stroke method to check pushrod stroke, how much pressure should you apply to the service brakes?
  39. How often should you inspect your vehicle?
  40. If 40 psi of pressure is applied to a brake chamber diaphragm of 30 square inches, the maximum force exerted would be
  41. Which of the following are major components of the air supply circuit?
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